In a manner characterized by forceful, heavy, or repeated striking or pounding, like the action of a hammer.
From 'hammer' plus '-ing' (present participle) plus '-ly' (adverbial suffix), creating an adverb describing hammer-like motion or forceful action.
This adverb appears in 19th-century literature to describe rain falling 'hammeringly,' hooves striking ground, or waves crashing—it evokes the relentless percussion of a blacksmith's workshop.
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